In EU, we know the cost of any wars and the fact creating a new circle of violence doesn't resolve anything.

We don’t have one village without a monument commemorating the dead people from the past wars. Everybody have at least a family member who fight or died because of a war... Just go one or two generations in the past (in my case my grandmother lost 2 sisters in WW2, my grandfather was captured and sent in acamp for 2 years and managed to escape and walk back to south of France. My other grandfather family moved to France because of Franco repression in Spain, another cycle of violence...)

All my ancestors have fought for the land i'm currently on during thousand of years... We have thousand of years of war history behind us... against germany, against the UK, against the whole EU at some point "thanks" to Napoleon, and i could go to the medieval time, or even before when we fighted against Rome... And you know what? I work everyday with Germans, British, Italian people... I didn’t kill them because they are not responsible of their leaders actions and country history...

You prosecute the responsibles of an attack (in the worse case you sent a little squad to assassinate the leaders if they hide and plan to harm you again) BUT you don’t murder all the civilians around to achieve this result. This is madness and incompetence. And that create a new cycle of violence that your children will have to pay at some point...

First, do no harm? What benefit did the US enjoy from attacking Afghanistan?